Furnace for water-tube boilers.



A. SMALLWO OD. FURNACE FOR WATER TUBE BOILERS.

APPLICATION FILED MAR.31.1908.

{ Patented Jan. 17,1911.

1. SHEETSSHEET 1.

m D U fife/ 12 02? WM NZMMW y I I .A: SMALLYVOOD. FURNACE FOR WA 'IZER TUBE BOILERS.

APifLIOATIOIj FILED MAR. 31, 190B.

Patented Jan. 17, 1911.

2 S HEEBTS-SHEET 2.

N I Q kl Q "8 '58 v & w vv 9 a M 1 n .mus w/v UNYETE ALFRED sMALLwooD, or LONDON, ENGLAND.

FURNACE FOR WATER-TUBE BOILERS.

Specification of-Letters Patent. Patented Jan. 17, 1911.

Application filed March 31, 1908. Serial No. 424,389.

To "all whom ibiifldy concern- Be it known that 1. ;\LFI\ED Snxnmvcon,

of 21 Coleman street, London, in the county of Middlesex. England, have invented certain new and useful Improvements in and Relating to Furnaces for Water-Tube Boilers; and I hereby declare that the following is a full, clear, and exact description of the same.

This invention relates to furnaces for water tube boilers, and has for its object a bet ter and more equal distribution of the heat upon the'water tubes. 1 By such improvements the heat is circulated and distributed around practically the whole area of the sides, fioor and crown ofthe tube chamber, and in such a manner thatthe heated gases are evenly distributed over the Water tubes, the water tubes being arranged as usual within the tube chamber to which the heat of one or more furnaces is supplied. The foundation of the furnace or furnaces may be solid throughout and free of any'arching or chambers and the floor of the tube chamber may be supported upon a series of longitudinal divisions formed of blocks of fire clay or the like in such a manner as to form a series of couduits under the floor and through which the heated gases circulate as hereinafter described.

The furnace has a horizontal combustion chamber continued for the full length of the boiler, and connected with side conduits under the floor of the tube chamber at the furnace chamber end or by a series of apertures whereby the gases pass from the;combustion chamber-to the side conduits intermediate its ends, the gases then passing from the side conduits, into heat chambers in the outer walls of the boiler casing, the gases passing from the heat chambers to the tube chamber where they are distributed against the water tubes, and from the tube chamber to the stack.

Provision is made by which a portion of the gases from the combustion chamber andside conduits may be allowed to enter the tube chamber at or near one or both ends of the water .tubes, this being convenientlyctlected by making seve al of the end slabs to slide -in their rabbcts and providing apertures having doors at the ends of the furnace whereby the position of such slabs can bc opencd and closed-or adjusted to allow more or less of the gases to enter the tube chamber at that point.

In order that this invention may be clearly understood and more easily carried into practice reference may be had to the appended explanatory two sheets of'drawings, on which: 1

Figure 1, is a diagrammatic sectional side elevation of a Babcock and Wilcox type of water tube boiler constructed in accordance with one form of the present invention. Fig. 2, is a sectional front elevation of the boiler illustrated in Fig. 1, the plane of section being on the line 1-2 thereof. Fig. 3,

is a sectional .front elevation of the boiler illustrated in Fig. 1, the plane of'section being on the line 34 thereof. Fig. 4:, is a sectional front elevation of the boiler illus trated in Fig. 1, the plane of section being on the line 5-6 looking toward the rear thereof.

The drawings demonstrate one method of carrying the. present invention into effect in which a single furnace chamber A is employed and in operation the furnacegases descend the fiue a. into the longitudinal com" bastion chamber B and thence pass into and backwardly along the heat fiuc ll which in turn leads into the side fines G at the furnace chamber end of the boiler. In cases in which the three fiues are employed as illustrated, damper controlled apertures h may be provided and adapted for communication with the side flues thereby affording a more even temperature. One or more horizontal or inclined fines D may be arranged in each side wall of the boiler and provided with a series of damper controlled apertures fl opening into the tube chamber, and the said fines may communicate with the fines below the floor at either extremity.

In the drawings provision is also illus trated whereby the gases from the combustion chamber B may be led directly into the fiues I) this being through the medium of a transverse flue (F at the back end of the furnace, the said flue leading into the side fines by uptakes (Z After traversing the central 'fiueH and side fines G, the gases may be introduced into the tines D by the uptakcs d through the medium of damper controlled apertures d, or the gases may be introduced into the fines 1 directly from the central fine H by the damper controlled apertures (Z these leading into the fines D at an approximately central position by the aptalces d. The divisions 7L forming the lines C ll, are adpted to support the floor of the ube chamber, such floor being constructed wholly or in part of fire clay slabs 7L3 certain or all of Which may be removable to provide for the introduction of gases to the tubes direct from either or both of the tines C, H, at any desired position in their length.

The combustion and ignition of the gases is assisted in their passage through the con duits by the intensity of heat contained in the slabs and divisions assisted as required by the admission of fresh air to the conduits, through the damper controlled openings d combustion being also assisted by the admission of fresh air, preferably heated, to suitable parts of the combustion chamber through the damper controlled openings d. The passage of gases introduced into the tube chamber is ballled by partitions such as E by which the draft is directed etliciently around the tubes of the boiler in its passage from the floor or side flues to the stack.

It will be obvious that the construction and mode of operation aforedescribed may be modified without departing from the invention and. that numerous Ytll'ltltlOIlS may be employed to etlect the requisite distribution of the heat in each particular type of boiler to which the invention is applicable.

ll aving thus fully described my invention what I claim as new and desire to secure by Letters Patent is:

l. A furnace tor a water tube boiler comprising a fire chamber, said furnacehaving eating with the tire chamber, a central heat line above and communicating with the combustion chamber, conduits at the sides of the central heat flue and connected therewith, heat chambers in the sides of the furnace, and vertical flues connecting the heat cham bers with the combustion chamber and heat flue and conduits. I

2. A furnace for a Water tube boiler comprising a fire chamber, said furnace having a combustion chamber in rear of and con nected with the fire chamber, a heat flue above and connected with the combustion chamber, heat conduits at the sides of the heatflue and connected therewith, a boiler chamber, a floor for the boiler chamber, and

heat chambers at the sides of the boiler chamber connected with the heat flue and conduits and provided with openings into the boiler chamber above the floor.

A furnace for a water tube boiler comprising a fire chamber, said furnace having combustion chamber in rear of and connectcd with the the chamber, a heat .tlue above and connected with the combustion chamber,

heat conduits at the sides of the heat tlue and connected therewith, a boiler chamber, a floor for the boiler chamber, heatchambers atthe sides of the boiler chamber connected with the heat flue and conduits and provided with openings into the boiler chamber above the floor, and battles within the boiler chamber.

.ln witness whereof I have hereunto set my hand in the presence of two witnesses.

ALFRED SMALIAVOOD.

Witnesses WALTER H. E. Banrnur, ARTHUR H. Bnowx. 

